tinehlanidota.-] T HE INFUSORIA. 387 



the latter has two spherical glands ; an ovarium is seen, 

 but no male structures ; a respiratory spur or tube is 

 observed at the neck in three species ; the red eye in con- 

 nexion with a cerebral ganglion is always present. They 

 do not increase in large masses. 



665. SALPINA mucronata (Brachionus mucrortatus, M.) 

 The short-spined Salpina. Lorica very minutely scabrous, 

 anteriorly four and posteriorly three-horned; these are 

 generally straight, and of equal length. The lorica, when 

 the creature is young, is soft and bent, but soon hardens, 

 and has horns. The spur, or respiratory tube, in the neck, 

 terminates in a little bristle, as seen in fig. 450. In some 

 specimens, Ehrenberg says, the lorica appears as if punc- 

 tated or stippled. Figs. 447, 448, represent full-grown 

 specimens, with the head withdrawn ; the latter figure is a 

 back view, the former an under one. Fig. 449 is a side 

 view, head extended. Fig. 451 is an egg, just deposited 

 on lemna; Jig. 452 another egg, with the young vibrating; 

 and f /zg. 450 another just escaped from the shell \ fig. 453 

 represents the teeth separately. Length of lorica 1- 144th. 



666. SALPINA spinigera. The thorny Salpina. Lo- 

 rica horned, four frontal, three posterior; the posterior dor- 

 sal horn longest, and a little recurved. Glands on the 

 alimentary canal not observed. Found amongst Cerato- 

 phyllum. Length of lorica 1- 140th. 



667. SALPINA ventralis. The long-opined Salpina. 

 Lorica stippled, horns two in front, three posterior, the 

 dorsal one short and decurved. Found amongst conferva, 

 &c. Length l-120th. 



668. SALPINA redunca. The uncinated Salpina. Lo- 

 rica smooth, horns two in front, three behind, two of the 



